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net: golang: Go net package: Denial of Service via long CNAME response in LookupCNAME

🗓️ 14 Jul 2026 15:41:07Reported by RedHatType 
redhat
 redhat🔗 access.redhat.com👁 22 Views

Go net LookupCNAME with the cgo resolver can crash from long CNAME responses, causing service denial.

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OSOS VersionArchitecturePackagePackage VersionFilename
Red Hat Enterprise Linux9.8aarch64git-lfs3.7.1-4.el9_8.2git-lfs-3.7.1-4.el9_8.2.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64legit-lfs3.7.1-4.el9_8.2git-lfs-3.7.1-4.el9_8.2.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xgit-lfs3.7.1-4.el9_8.2git-lfs-3.7.1-4.el9_8.2.s390x.rpm
Red Hat Enterprise Linux9.8x86_64git-lfs3.7.1-4.el9_8.2git-lfs-3.7.1-4.el9_8.2.x86_64.rpm
Red Hat Enterprise Linux9.8aarch64git-lfs-debuginfo3.7.1-4.el9_8.2git-lfs-debuginfo-3.7.1-4.el9_8.2.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64legit-lfs-debuginfo3.7.1-4.el9_8.2git-lfs-debuginfo-3.7.1-4.el9_8.2.ppc64le.rpm
Red Hat Enterprise Linux9.8s390xgit-lfs-debuginfo3.7.1-4.el9_8.2git-lfs-debuginfo-3.7.1-4.el9_8.2.s390x.rpm
Red Hat Enterprise Linux9.8x86_64git-lfs-debuginfo3.7.1-4.el9_8.2git-lfs-debuginfo-3.7.1-4.el9_8.2.x86_64.rpm
Red Hat Enterprise Linux9.8aarch64git-lfs-debugsource3.7.1-4.el9_8.2git-lfs-debugsource-3.7.1-4.el9_8.2.aarch64.rpm
Red Hat Enterprise Linux9.8ppc64legit-lfs-debugsource3.7.1-4.el9_8.2git-lfs-debugsource-3.7.1-4.el9_8.2.ppc64le.rpm
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02 Oct 2026 17:31Current
7.1High risk
Vulners AI Score7.1
CVSS 3.17.5
EPSS0.00813
SSVC
CWE-1341
go netlookup cnamecgo resolverlong cnamememory crashservice denial
22